CUSCO Magnetic Oil Drain Plug M20 x P1.5mm (For Subaru)CUSCO Magnetic Oil Drain Plug uses a powerful 4,500 Gauss Neodymium Magnet, it will capture unwanted metallic pollutants and microscopic particles that reside in engine oils, even those which may not be captured by oil filter. A7075 Duralumin Alloy drain plug body material is a standard in the aerospace industries and being one of the lightest and most durable material. The drain bolt comes with and aluminum ring gasket. For Subaru Impreza WRX STi